981855491 has 2 divisors, whose sum is σ = 981855492. Its totient is φ = 981855490.

The previous prime is 981855481. The next prime is 981855499. The reversal of 981855491 is 194558189.

981855491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981855491 is a prime.

It is not a weakly prime, because it can be changed into another prime (981855499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490927745 + 490927746.

It is an arithmetic number, because the mean of its divisors is an integer number (490927746).

Almost surely, 2^981855491 is an apocalyptic number.

981855491 is a deficient number, since it is larger than the sum of its proper divisors (1).

981855491 is an equidigital number, since it uses as much as digits as its factorization.

981855491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 50.

The square root of 981855491 is about 31334.5734134039. The cubic root of 981855491 is about 993.9148767161.

The spelling of 981855491 in words is "nine hundred eighty-one million, eight hundred fifty-five thousand, four hundred ninety-one".